//++ and -- Operator overloading
#include <iostream.h>
#include <process.h>

class clock
{
	int hours, min;
	public:
		clock(int th, int tm)
		{
			hours=th;
			min=tm;
		}
		void display()
		{
			cout<<"\nThe time is "<<hours<<":"<<min;
		}
		void operator ++() //prefix ovrldng
		{
			hours++;
		}
		void operator ++(int temp) //postfix 
		{
			min++;
		}
		void operator --() //prefix
		{
			hours--;
		}
		void operator --(int temp)//postfix
		{
			min--;
		}
};

int main()
{
	clock c(12,0);
	int ch;
	menu:
	c.display();
	cout<<"\nMenu:\n1. Advance time by 1 hour\n2. Advance time by 1 minute\n3. Reduce time by 1 hour\n4. Reduce time by 1 minute\n5. Exit\nEnter choice...";
	cin>>ch;
	switch(ch)
	{
		case 1:
			++c;
			break;
		case 2:
			c++;
			break;
		case 3:
			--c;
			break;
		case 4:
			c++;
			break;
		case 5:
			exit(0);
		default:
			cout<<"\nInvalid Choice!";
			goto menu;
	}
	goto menu;
}